Hi - I'm using LR4.1 on an iMac running Lion. Everything was working fine until I created a new catalog and imported about 5000 images (all Nikon NEFs). Then, the problems started. LR4.1 hung when creating previews. After I terminated LR, it hung during startup and close. It also hangs my Mac (unable to shut down without using hard shutdown). Now, other catalogs are getting corrupt. I also downloaded a Flash player update recently -- not sure if that's related. I've already tried deleting the preferences file that others have seemed to have problems with -- that fixed it briefly, but now even a catalog that was previously working fine is now corrupt. Can someone help?
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